Fire detector



FIG. 1 is a perspective view of a fire detector showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a side elevational view, with the opposite side being a mirror image thereof. 

The ornamental design for a fire detector, as shown and described. 